Leonard,

Thanks for the dimension. I will make it 17-1/2" and go with that. I feel alot more comfortable going ahead with that dimension now that a couple of you guys came up with the same dimension. It is great having guys like you help me out on this project. I really appreciate all the tips and information and pictures that everyone has. This is my first truck project, and can honestly say that there hasn't been a better group of guys and gals that are willing to help out any way they can. Thanks again, and we'll keep in touch.
Ed